Migmatite
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Migmatite is a rock formed under high-grade metamorphism by partial melting, producing a mixture of metamorphic and newly formed igneous material. It typically occurs in the deeper parts of the contin
Ptygmatic folding in migmatite on Naissaar Island, Estonia
Migmatite on the coast of Saaremaa, Estonia
Intricately-folded migmatite from near Geirangerfjord, Norway
Migmatite rock in Saaremaa, Estonia
Gneiss
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Gneiss is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary roc
Migmatite
…A2' to metamorphic schists 'C1' in which the initial sedimentary components can still be discerned. Deeper still, the schists are reconstituted as gneiss 'C2' in which folia of residual minerals alternate with quartzo-feldspathic layers; partial melting continues as small batches of leucosome coalesce…
Sample of gneiss exhibiting "gneissic banding"
Orthogneiss from the Czech Republic
Augen gneiss from Leblon, Rio de Janeiro City, Brazil
Ordovician augen gneiss outcrop, Canigó massif, eastern Pyrenees, France